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2. Industrial fan - Wikipedia

   en.wikipedia.org/wiki/Industrial_fan

   The axial fan is often contained within a short section of cylindrical ductwork, to which inlet and outlet ducting can be connected. Axial fan types have fan wheels with diameters that usually range from less than a foot (0.3 meters) to over 30 feet (9.1 m), although axial cooling tower fan wheels may exceed 82 feet (25 m) in diameter.

3. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   In high temperature ducts, or ducts with wear potential, 2 + 1 ⁄ 2-inch refractory, is often anchored to the duct plate with V anchors at 6" O.C. (+/-) to resist a) temperature, or b) wear at elbows or a combination of these effects. Occasionally ceramic tiles or ceramic mortars are anchored to ductwork to resist temperature and wear.

4. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

5. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   It is available in diameters ranging from as small as 4" (10 cm) to as big as 18" (45 cm), but the most commonly used are even sizes ranging from 6" to 12" (15 to 30 cm). Flexible duct is very convenient for attaching supply air outlets to the rigid ductwork. It is commonly attached with long zip ties or metal band claps.

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   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Reports of rats are on the rise in Tri-Cities. Here’s what ...

   www.aol.com/reports-rats-rise-tri-cities...

   Rats can squeeze through an opening the size of a half dollar, according to the health district. The Fish and Wildlife Department says they also can start chewing on a hole just a quarter inch in ...